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A method for preparing pure phase bismuth titanate and titanium oxide composite material by alcohol thermal method

A pure-phase bismuth titanate and composite material technology, which is applied in the field of preparation of bismuth titanate-titanium oxide composite materials, can solve the problems of high process requirements and complex synthesis routes, and achieve the effect of simple preparation process and low cost

Active Publication Date: 2016-03-30
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above improved method can obtain bismuth titanate-titanium oxide composite nanomaterials with regular morphology, but the synthesis route is more complicated and the process requirements are higher

Method used

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  • A method for preparing pure phase bismuth titanate and titanium oxide composite material by alcohol thermal method
  • A method for preparing pure phase bismuth titanate and titanium oxide composite material by alcohol thermal method
  • A method for preparing pure phase bismuth titanate and titanium oxide composite material by alcohol thermal method

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Mix glycerol and ethanol, stir and mix thoroughly, then add bismuth nitrate solid and dissolve it completely, slowly add tetrabutyl titanate into the mixture, stir vigorously for 30 minutes, and then ultrasonically treat the mixture for 15 minutes Transfer to a reaction kettle; the molar ratio of bismuth nitrate and tetrabutyl titanate is 0.2:1; the volume ratio of glycerol and ethanol is 0.05:1. Place the reaction kettle in a constant temperature oven at 120°C to react for 24 hours; after cooling, filter and dry the mixture in the kettle and place it in a temperature-controlled furnace for calcination at 600°C for 3 hours. After cooling, grind the calcined product into a powder with uniform particles. After X-ray diffraction pattern and comparison with cards 04-0477 and 32-0118, it can be confirmed that the obtained sample is Bi 2 Ti 2 o 7 / TiO 2 composite material.

[0030] figure 1 It is the X-ray diffraction spectrum of the sample prepared in embodiment 1, can ...

Embodiment 2

[0032] Mix glycerol and ethanol, stir and mix thoroughly, then add bismuth nitrate solid and dissolve it completely, slowly add tetrabutyl titanate into the mixture, stir vigorously for 30 minutes, and then ultrasonically treat the mixture for 15 minutes Transfer to a reaction kettle; the molar ratio of bismuth nitrate and tetrabutyl titanate is 0.2:1; the volume ratio of glycerol and ethanol is 0.1:1. Place the reaction kettle in a constant temperature oven at 120°C to react for 24 hours; after cooling, filter and dry the mixture in the kettle and place it in a temperature-controlled furnace for calcination at 600°C for 3 hours. After cooling, grind the calcined product into a powder with uniform particles. After X-ray diffraction pattern and comparison with cards 04-0477 and 32-0118, it can be confirmed that the obtained sample is Bi 2 Ti 2 o 7 / TiO 2 composite material.

[0033] image 3 It is the X-ray diffraction spectrum of the prepared sample of embodiment 2, can d...

Embodiment 3

[0035] Mix glycerol and ethanol, stir and mix thoroughly, then add bismuth nitrate solid and dissolve it completely, slowly add tetrabutyl titanate into the mixture, stir vigorously for 30 minutes, and then ultrasonically treat the mixture for 15 minutes Transfer to a reaction kettle; the molar ratio of bismuth nitrate and tetrabutyl titanate is 0.2:1; the volume ratio of glycerol and ethanol is 0.2:1. Place the reaction kettle in a constant temperature oven at 120°C to react for 24 hours; after cooling, filter and dry the mixture in the kettle and place it in a temperature-programmed furnace for calcination at 500°C for 3 hours. After cooling, grind the calcined product into a powder with uniform particles. After the X-ray diffraction pattern and comparison with the cards JCPDS04-0477 and 32-202, it can be determined that the obtained sample is Bi 20 TiO 32 / TiO 2 composite material.

[0036] Figure 5 It is the X-ray diffraction spectrum of the sample prepared in embodim...

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Abstract

The invention discloses a method for preparing a pure phase bismuth titanate and titanium oxide composite material by using an alcohol heat method. The method comprises the following steps: adding a bismuth nitrate solid in a mixed solvent of glycerin and ethyl alcohol the volume ratios being (0.05-0.2) to 1, fully dissolving the bismuth nitrate solid in the mixed solvent, dropwise adding tetrabutyl titanate in the solution, stirring and carrying out ultrasonic treatment on the solution, transferring the mixed solution in a reaction kettle, arranging the reaction kettle in a 110-150 DEG C constant temperature oven and reacting for 18-24h, cooling, filtering and drying a mixture in the reaction kettle, burning the mixture in a procedure temperature control furnace for 1-3h under 500-600 DEG C, and preparing the pure phase bismuth titanate and titanium oxide composite material. The method provided by the invention has the advantages that the bismuth titanate and titanium oxide composite material with different types and shapes are obtained by controlling, bismuth titanate comprises a pure phase Bi4Ti3O12, Bi2Ti2O7 or Bi2TiO32, and the shape of the composite material comprises a globular shape, a petal shape, a three-dimensional layer shape and a piece shape and the like.

Description

technical field [0001] The invention belongs to the field of materials and catalysts, and in particular relates to a method for preparing a bismuth titanate-titanium oxide composite material. The prepared composite material has good photocatalytic degradation activity of organic pollutants under sunlight. Background technique [0002] In recent years, heterojunction compound semiconductor materials formed by the coupling of narrow bandgap semiconductors and wide bandgap semiconductors have attracted the attention of researchers. Among various narrow-bandgap semiconductors, bismuth titanate compounds (Bi 2 Ti 2 o 7 、 Bi 12 TiO 20 、 Bi 20 TiO 32 etc.) are a class of semiconductor photocatalytic materials with high visible light activity. TiO with high band gap energy 2 (3.2eV) and bismuth titanate compounds with low band gap energy can form potential barriers and energy valleys at the interface, change the migration process of photogenerated carriers, and promote the e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/18
Inventor 王玉萍张祖云杨维本
Owner NANJING NORMAL UNIVERSITY
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